Kickass mop but, yes, the caps and nibs are little bit finicky. Nibs will dry out without constant use, especially with smash, the tops will stretch out slightly wedging the nib inside the cap. Easy fix for this kiddies: Just press down on the cap while unscrewing to keep the nib pressed into the mop body and pay attention to what you're doing. You should be treating ink like poison. If you can get over the few quirks, the Mini Crusher will put a smile on your face.